Freedom
The Freedom class is a newer starship design, incorporating an ellipsoid hull and one Galaxy type warp nacelle.

The "Frying Pan" class is the only one with a singler warp nacelle knwon by now.  The Firebrand was among the ships in the Wolf 359 graveyard, and is depicted in teh Star Trek Fact Files.

It has been argued that the ship wouldn't violate Roddenberry design rule #2 (nacelles must be in pairs) because the Galaxy-class nacelle has warp coils in pairs.  But since they are vertically staggered, they woulod act more like a singe coil than if they were beside each other.  So if the warp engines are co-dependent, it would be a very inefficient arrangement.

It is uncertain whether it is  the "Concord" (after the capital of New Hampshire) or the "Concorde" (the French spelling and also the name of the supersonic passenger plane).  It's listed here as "Concorde" because of my soliditary with everything European.